Scientists work on a new anthrax vaccine inside Porton Down in Wiltshire, 1964. Biosecurity has long been a concern inside Britain’s secretive research facility. PA Images/Alamy

Why are safety concerns being raised inside Porton Down, Britain’s nerve centre of chemical and biological research?

A whistleblower has raised safety concerns about working inside Porton Down, which has a long history of conducting dangerous biochemical research.

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